JP2003172278A - Gas compressor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent a noise caused by a vibration during the rotation of a rotor. <P>SOLUTION: Of two delivery ports provided on a side wall of a cylinder 40, the delivery port 42A is provided at a position positioned at a distance L from a short diameter axis F and the delivery port 42B is provided at a position positioned at a distance M from the short diameter axis F. Both delivery ports are provided at asymmetrical positions each other regarding a rotation shaft 51 of the rotor 50. Thereby, timing that compressed coolant is alternately delivered from both delivery ports is deviated and a vibration frequency is divided to two. As a result, a peak value at a basic component is reduced and a noise is prevented. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to the structure of a rotary vane type gas compressor used in an air conditioning system for vehicles.

[0002]

2. Description of the Related Art A gas compressor used for compressing a refrigerant in an air conditioner or the like is provided with a rotor provided with a plurality of vanes rotatably provided in a cylinder having a substantially elliptical inner peripheral surface arranged in a compressor case. The space partitioned by the vanes in accordance with the rotation forms a compression chamber in which the volume changes repeatedly, and the refrigerant gas sucked from the suction port into the compression chamber is compressed and discharged from the discharge port.

FIG. 2 is a vertical sectional view showing such a conventional gas compressor, and FIG. 3 is a sectional view taken along the line AA in FIG.
The compressor case 10 includes a housing 11 that is open at one end and a front head 12 that is attached to the opening side thereof.
Are formed. A cylinder 40 having a substantially elliptical inner circumference is provided in the housing 11 so that the front side block 2
A rotor 50 having a plurality of vanes, which is disposed between 0 and the rear side block 30, is rotatably provided in the cylinder 40.

The rotating shaft 51, which rotates integrally with the rotor 50,
The front end side extends through the front side block 20 and extends outward from the lip seal 18 on the end wall of the compressor case.
The rear end is supported by the rear side block 30. An electromagnetic clutch 25 having a pulley 24 is attached to the front end of the rotary shaft so as to receive a rotational driving force from a crank pulley of an engine (not shown).

In particular, as shown in FIG. 3, a plurality of vane grooves 53 extending in the radial direction are formed in the rotor 50 at equal intervals in the circumferential direction around the rotation shaft 51 of the rotor, and the vanes 58 are formed.
Is slidably mounted. Vane 58 is rotor 50
During rotation, the centrifugal force and the hydraulic pressure applied to the bottom of the vane groove 53 urge the inner peripheral surface of the cylinder 40. The inside of the cylinder 40 is partitioned into a plurality of small chambers by the rotor 50 and the vanes 58, and forms a compression chamber 48 in which the volume changes repeatedly as the rotor 50 rotates.

A front suction chamber 13 having a refrigerant gas suction port 14 is formed between the front head 12 and the front side block 20. The front side block 20 has a suction port 22 for communicating the front suction chamber 13 and the compression chamber 48.

A discharge chamber 15 is formed between the closed side of the housing 11 and the rear side block 30 and has a refrigerant gas discharge port 16. A discharge chamber 44 is cut out in the outer peripheral portion in the vicinity of the short diameter portion of the cylinder 40 to form a thin portion, and a discharge port 42 is opened in this thin portion. The discharge port 42 is provided with a reed valve 43. Discharge port 4
The refrigerant gas discharged from No. 2 is discharged from the discharge chamber 44 to the discharge chamber 15 via the oil separator 38. The suction port 22 and the discharge port 42 are provided at two locations along the peripheral portion of the cylinder, symmetrically with respect to the rotation axis of the rotor.

When the rotor 50 rotates, the refrigerant gas flowing into the refrigerant gas intake port 14 is cooled by the refrigerant gas.
Is sucked into the compression chamber 48 through the suction port 22. Then, after being compressed in the compression chamber 48, the refrigerant gas is discharged from the discharge port 42, and the refrigerant gas passes through the discharge chamber 15 and the refrigerant gas discharge port 1
6 is supplied to the outside.

[0009]

By the way, in such a gas compressor, conventionally, vibration is generated when the rotor 50 is rotated and driven, and this causes vibration to an evaporator or a condenser connected to the gas compressor. In many cases, noise was generated by propagating to peripheral equipment including piping. FIG. 4 shows the generation state of the acceleration component measured in the gas compressor. Examining the cause of the vibration, in the frequency analysis of the vibration waveform, a very large peak appears in the vibration of the basic compression (discharge) component of the gas compressor, which resonates with peripheral equipment and causes abnormal noise. It turned out that it has become.

More specifically, in a gas compressor provided with five vanes, since there are two discharge ports, the compressed refrigerant is discharged ten times for each rotation of the rotor, and vibration of 10 × rotor rotation speed is generated. Is the basic ingredient. Therefore, in view of the above problems, it is an object of the present invention to provide a gas compressor that prevents vibration having a large peak when the rotor rotates and prevents abnormal noise.

[0011]

Therefore, since the basic component of the vibration that causes a peak is proportional to the rotor rotation speed, the occurrence of the peak can be suppressed by breaking this matching. According to the invention of Item 1, a rotor having a plurality of vanes supported in respective vane grooves is rotatably provided in a cylinder, the inner peripheral surface of which is arranged in a compressor case, and is partitioned by vanes. In a gas compressor in which the space is used as a compression chamber and the gas compressed in the compression chamber is discharged from the discharge port formed on the side wall of the cylinder to the discharge chamber outside the cylinder, the discharge port is asymmetric with respect to the rotation axis of the rotor. It is assumed that the position is set. According to the second aspect of the present invention, the openings of the vane grooves on the outer peripheral surface of the rotor are set at non-uniform intervals in the circumferential direction.

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below. FIG. 1 is a diagram showing an embodiment, and FIG. 1A is a sectional view corresponding to FIG. Further, (b) shows an arrow B in (a), and (c) shows an arrow C in (a). The rotor 50, which rotates about the rotating shaft 51 in the cylinder 40, has five vane grooves 53 that are open in the circumferential surface and extend in the radial direction at equal intervals in the circumferential direction. It is supported.

On the other hand, the discharge port 4 formed in the cylinder 40
2A and 42B are discharge chambers 44A and 44B in the vicinity of the two minor diameter portions of the cylinder, particularly (b),
As shown in (c), it is composed of two holes 45, 45 arranged and opened in the axial direction. Reed valves 43 are provided at these discharge ports 42 as shown in FIG. A reed valve is not shown in FIGS. The discharge ports 42A and 42B are provided at asymmetrical positions with respect to the rotating shaft 51 of the rotor.
That is, in the discharge chamber 44A, the discharge port 42A is provided at a position of a distance L from the minor axis F, and the discharge chamber 4A
In 4B, the discharge port 42B is provided at a position of a distance M from the minor axis F, and L <M is set to be different in size. Other configurations are the same as those shown in FIGS. 2 and 3.

As a result, as the rotor 50 rotates, the refrigerant compressed in one compression chamber formed between the vanes 58 is discharged from one discharge port 42A, and then the refrigerant compressed in the other compression chamber is discharged to the other. The ejection from the ejection port 42B and the subsequent ejection from the ejection port 42A are repeated, but since the two ejection ports are asymmetrical with respect to the rotation shaft 51 of the rotor, the ejection from the ejection port 42A is not performed. The ejection timing from the ejection port 42B is advanced, and the ejection port 4
The ejection timing from the ejection port 42A after the ejection from 2B is delayed. Therefore, the cycle of vibration due to ejection is 1
However, since it is divided into two vibration periods, the magnitude of the fundamental vibration component is reduced.

Since the present embodiment is configured as described above and the two discharge ports 42A and 42B provided in the cylinder 40 are provided in asymmetrical positions with respect to the rotary shaft 51 of the rotor 50, the compressed refrigerant is As a result that the timings at which the ink is ejected from the ejection ports are shifted and the vibration cycle is divided into two, the peak value in the basic component is reduced, and abnormal noise is prevented.

Although the vanes 58 supported by the rotor 50 are set at equal intervals in the embodiment, in addition to the two discharge ports being asymmetrical with respect to the rotating shaft 51 of the rotor, the rotor is further provided. It is also possible to make the opening intervals of the vane grooves 58 uneven on the outer peripheral surface of the. As a result, the vibration cycle becomes more irregular, and the peak value in the vibration basic component is further reduced.

[0017]

As described above, according to the present invention, in the rotary vane type gas compressor, the discharge port is set at an asymmetrical position with respect to the rotation axis of the rotor. Since the timings at which the ink is ejected from both ejection ports are shifted and the ejection cycles become unequal, the periodicity of vibration is reduced and the generation of abnormal noise is prevented. Furthermore, the openings of the vane grooves on the outer peripheral surface of the rotor are set to have uneven intervals in the circumferential direction, so that the vibration cycle becomes more irregular, and the effect of preventing abnormal noise is further enhanced.

[Brief description of drawings]

FIG. 1 is a diagram showing an embodiment of the present invention.

FIG. 2 is a vertical sectional view showing a conventional gas compressor.

3 is a sectional view taken along the line AA in FIG.

FIG. 4 is a diagram showing a vibration generation state in a conventional example.

[Explanation of symbols]

10 compressor case 11 housing 12 front head 13 Front side suction chamber 14 Refrigerant gas intake port 15 Discharge chamber 16 Refrigerant gas discharge port 20 front side blocks 22 Suction port 30 rear side block 38 Oil separator 40 cylinders 42, 42A, 42B outlet 43 Reed valve 44, 44A, 44B Discharge chamber 48 compression chamber 50 rotor 51 rotation axis 53 vane groove 58 vanes

Claims (2)

[Claims] 1. A rotor rotatably supporting a plurality of vanes in respective vane grooves is rotatably provided in a cylinder whose inner peripheral surface is arranged in a compressor case and has a substantially elliptical shape, and a space partitioned by the vanes is formed. In a gas compressor, which is a compression chamber and discharges gas compressed in the compression chamber to a discharge chamber outside the cylinder from a discharge port formed on the side wall of the cylinder, the discharge port has an asymmetrical position with respect to the rotation axis of the rotor. A gas compressor characterized by being set to. 2. The gas compressor according to claim 1, wherein the openings of the vane grooves on the outer peripheral surface of the rotor are set at unequal intervals in the circumferential direction.